Health Tools
BMI, calorie, sleep, pregnancy, and fitness calculators for everyday health tracking. 11 free tools, no sign-up required.
BMI Calculator
Check your Body Mass Index from height and weight.
Calorie / BMR Calculator
Estimate your daily calorie needs and basal metabolic rate.
Ideal Weight Calculator
Estimate a healthy weight range for your height.
Body Fat % Calculator
Estimate body fat percentage from height, neck, and waist (U.S. Navy tape-measure method).
Sleep Cycle Calculator
Find the best time to sleep or wake up, based on 90-minute sleep cycles.
Heart Rate Training Zone Calculator
Estimate your maximum heart rate and see your five cardio training zones.
Water Intake Calculator
Estimate your recommended daily water intake from weight and activity level.
Breathing Exercise Timer
A guided breathing timer with an animated pacing orb — Box Breathing by default, fully adjustable for any inhale/hold/exhale/pause pattern.
Pregnancy Due Date Calculator
Estimate your due date from your last period or conception date.
Ovulation & Fertile Window Calculator
Estimate your next ovulation date and fertile window from your last period and average cycle length.
Running Pace Calculator
Calculate running pace, finish time, or distance — enter any two and get the third, in min/km or min/mile.